Expansion, means more and bigger. Will this be true for the easyAVR6? Sure it will, it will change the fun, but still a bit limited board to a powerful platform for developing serious circuits.
For starters you can buy direct compatible LCD and GLCD displays together with touchscreens for your GLCD. The following is a short list of some of the upgrades you can get.
For an up-to-date list, visit MikroElektronikas site. http://www.mikroe.com/en/
Here you can find all the different development boards they offer as well as extra boards, adapters, books and all sorts of fun.
On next page we'll take a look at my conclusion for this board.